Ravelli FRANCESCA Manuel D'utilisation Et D'entretien page 16

This pellet insert is suitable for Zero Clearance installation.
Flex pipe for vent is not approved these types of installation.
User and maintenance manual for stoves with RDS technology
In Canada this fireplace insert must be installed with
a continuous chimney liner of a minimum 3" diameter
extending from the insert to the top of the chimney. The
chimney liner must be conform to the class 3 requirements
of CAN/ULC-S635, Standard for Lining Systems for
ExistingMasonry or Factory Built Chimneys and Vents,
or CAN/ULC-S640, Standard for Lining Systems for New
Masonry Chimneys.
01/02/2016
Pag.16